Analyzing powers and cross sections ofp→p→pnπ+near threshold
| Autor: | W. W. Jacobs, P. V. Pancella, W. K. Brooks, R. W. Flammang, W. W. Daehnick, R. A. Thompson, J. G. Hardie, T. Rinckel, D. J. Tedeschi, E. J. Stephenson, C. C. Foster, S. A. Dytman, T. Vrana |
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| Rok vydání: | 1998 |
| Předmět: | |
| Zdroj: | Physical Review C. 58:916-931 |
| ISSN: | 1089-490X 0556-2813 |
| Popis: | Analyzing powers for {rvec p}p{r_arrow}pn{pi}{sup +} were measured for the first time close to threshold at beam energies that yield maximum pion momentum fractions ({eta}{equivalent_to}p{sub c.m.}{sup max}/m{sub {pi}}c) of {eta}=0.22, 0.42, and 0.50, and enable a decomposition of the low order partial waves. Cross sections were measured at seven different beam energies with {eta}=0.07, 0.17, 0.22, 0.28, 0.34, 0.42, and 0.50. The analysis shows that pion s-wave channels dominate the reaction. The p-wave channel containing the {Delta} resonance contributes, at {eta}=0.22, less than one-tenth of the total cross section and less than one-third of the total cross section at {eta}=0.42 and 0.50. The nonresonant p-wave channel contributes less than 1{percent} of the cross section at these three energies. {copyright} {ital 1998} {ital The American Physical Society} |
| Databáze: | OpenAIRE |
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